Question

10. By selling an article for 1600, a shopkeeper loses 20%. For how much should he sell it to gain 20%?
1
11. By selling a watch for 1505, a man gains of its cost price. Find the cost price of the watch.
6
12. By selling 8 dozen pencils, a shopkeeper gains the selling price of one dozen pencils. Find his gain per cent.​

Answer 1

Answer:

Let us first calculate CP of the article.

So, Let CP be x.

x-20% of x = 1600

x-x/5 = 1600

4x/5 = 1600

x = 1600*5/4 = 2000.

Now,

Gain = 20%

So, SP = 2000 + 20% of 2000

i.e. 2000 +400 = 2400.

So, To gain 20%, he should sell the article

in Rs 2400.